WO2015074245A1 - Temporisateur adaptatif pour délai de commutation inter-technologie d'accès radio optimisé dans un dispositif double radio - Google Patents

Temporisateur adaptatif pour délai de commutation inter-technologie d'accès radio optimisé dans un dispositif double radio Download PDF

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Publication number
WO2015074245A1
WO2015074245A1 PCT/CN2013/087686 CN2013087686W WO2015074245A1 WO 2015074245 A1 WO2015074245 A1 WO 2015074245A1 CN 2013087686 W CN2013087686 W CN 2013087686W WO 2015074245 A1 WO2015074245 A1 WO 2015074245A1
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WO
WIPO (PCT)
Prior art keywords
network
timing period
rat
condition
interface
Prior art date
Application number
PCT/CN2013/087686
Other languages
English (en)
Inventor
MingKai Nan
Huan Wang
Jing Li
Original Assignee
Qualcomm Incorporated
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to PCT/CN2013/087686 priority Critical patent/WO2015074245A1/fr
Publication of WO2015074245A1 publication Critical patent/WO2015074245A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service

Definitions

  • Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on.
  • These systems may be multiple-access systems capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power).
  • Examples of such multiple-access systems include code-division multiple access (CDMA) systems, time-division multiple access (TDMA) systems, frequency-division multiple access (FDMA) systems, and orthogonal frequency-division multiple access (OFDMA) systems.
  • CDMA code-division multiple access
  • TDMA time-division multiple access
  • FDMA frequency-division multiple access
  • OFDMA orthogonal frequency-division multiple access
  • a wireless multiple-access communications system may include a number of base stations, each simultaneously supporting communication for multiple mobile devices.
  • Base stations may communicate with UEs on downstream and upstream links.
  • Each base station has a coverage range, which may be referred to as the coverage area of the cell.
  • Wireless technology is rapidly changing. As a result, technologies of many different kinds coexist.
  • a mobile device also known as a user equipment (UE)
  • UE user equipment
  • Switching from one RAT to another may involve searching for a network that is available to provide service and, if a suitable network is found, attempting to establish a communications interface with the new network.
  • One or both of these processes may be prolonged to the extent that they introduce a significant delay. Or they may fail outright.
  • a single timing period may be longer than necessary to determine whether a network is available to provide service, but not long enough to establish a radio interface with a detected network.
  • a UE may determine that a condition has been met relating to the availability of a first network.
  • the condition may relate to receiving an Out of Service (OOS) or Radio Link Failure (RLF) indication, or it may relate to an indication that a new network has been detected that may be available to provide service.
  • OOS Out of Service
  • RLF Radio Link Failure
  • the UE may then adaptively select a timing period according to a RAT switching scheme based at least in part on the condition.
  • the UE may then initiate a timer based on the timing period. The timer may be used to determine when to terminate a search attempt or when to terminate an attempt to establish an interface with a new network.
  • the condition may be based at least in part on an Out of Service (OOS) indication for the first network or a Radio Link Failure (RLF) of the first network.
  • OOS Out of Service
  • RLF Radio Link Failure
  • the UE may also search for a candidate network that is available to provide service, and initiate an interface with the candidate network prior to determining that the timing period has elapsed.
  • a candidate network may not be available, and/or it may be determined that the timing period has elapsed prior to finding the candidate network. Then the UE may terminate the search for the candidate network.
  • the condition may be based at least in part on an indication that the first network is available to provide service. Then the UE may initiate a radio interface with the first network. In some cases the UE may successfully establish the radio interface with the first network prior to determining that the timing period has elapsed. In other cases, it may be determined that the timing period has elapsed prior to successfully establishing the radio interface with the first network. Then the UE may terminate the radio interface with the first network.
  • the UE may establish an interface with a second network, communicate with the first network using a first modem, and communicate with the second network using a second modem.
  • the first network uses a first RAT and the second network uses a second RAT.
  • the first RAT may be a third generation (3G) or a fourth generation (4G) technology and the second RAT may be a second generation (2G) technology.
  • communicating with the first network further comprises sending data over a packet switched radio link
  • communicating with the second network further comprises sending data over a circuit switched radio link.
  • adaptively selecting the timing period further comprises changing a value of a timing period variable.
  • a RAT switching scheme may comprise a plurality of variables that represent different switching circumstances.
  • the RAT switching scheme may comprise one or more categories. In some cases the one or more categories may be based at least on a source network being a 2G network, a 3G network, or a 4G network or on a target network being a 2G network, a 3G network, or a 4G network.
  • a first category is based at least in part on a source network being a 2G network on a detected target network that is a 3G network or a 4G network
  • a second category is based at least in part on a source network being a 3G network and the detected target network being a 2G network or a 4G network
  • a third category is based at least in part on the source network being a 4G network and the detected target network being a 2G network or a 3G network.
  • a first category is based at least in part on a source network being a 2G network and a detected target network being a 3G network or a 4G network
  • a second category is based at least in part on the source network being a 3G network or a 4G network and the detected target network being a 2G network, a 3G network or a 4G network.
  • the apparatus may include means for determining that a condition has been met relating to an availability of a first network, means for adaptively selecting a timing period according to a radio access technology (RAT) switching scheme based at least in part on the condition, and means for initiating a timer based at least on the timing period.
  • RAT radio access technology
  • the apparatus may include a processor and memory in electronic communication with the processor. Instructions may be stored in the memory. The instructions may be executable by the processor to determine that a condition has been met relating to an availability of a first network, adaptively select a timing period according to a radio access technology (RAT) switching scheme based at least in part on the condition, and initiate a timer based at least on the timing period.
  • RAT radio access technology
  • a computer program product for wireless communication includes a non-transitory computer-readable medium storing instructions executable by a processor to determine that a condition has been met relating to an availability of a first network, adaptively select a timing period according to a radio access technology (RAT) switching scheme based at least in part on the condition, and initiate a timer based at least on the timing period.
  • RAT radio access technology
  • FIG. 1 shows an example system diagram of UEs communicating with networks utilizing different RATs
  • FIG. 2 shows a block diagram of an exemplary UE
  • FIG. 3 shows a block diagram of an exemplary UE displaying a more detailed view of the RAT switching module
  • FIG. 4 shows a block diagram of an example of a RAT switching module
  • FIG. 5 shows a block diagram of an exemplary UE configured to switch between networks utilizing different RATs
  • FIG. 6 shows a diagram of a UE communicating with networks utilizing different RATs
  • FIGS. 7A, 7B, 7C, and 7D show diagrams of various examples of a UE switching between networks utilizing different RATs.
  • FIG. 8 is a flowchart of a method for switching communications between networks that utilize different RATs
  • FIG. 9 is a flowchart of a method for switching communications between networks that utilize different RATs subsequent to an OOS or RLF indication.
  • FIG. 10 is a flowchart of a switching communications between networks that utilize different RATs subsequent to an indication that a network is available to provide service.
  • a UE may determine that a condition has been met relating to the availability of a first network.
  • the condition may relate to receiving an Out of Service (OOS) or Radio Link Failure (RLF) indication, or it may relate to an indication that a new network has been detected that may be available to provide service.
  • OOS Out of Service
  • RLF Radio Link Failure
  • the UE may then adaptively select a timing period according to a RAT switching scheme based at least in part on the condition.
  • the UE may then initiate a timer based on the timing period. The timer may be used to determine when to terminate a search attempt or an attempt to establish an interface with the a new network.
  • Adaptively selecting a timing period based on a condition according to a RAT switching scheme may thus reduce unnecessary delays and wasted resources when attempting to search for, or establish an interface with, a new network. Specifically, in some cases it may be appropriate for the timing period associated with searching for a new network to be shorter than the time period associated with attempting to establish an interface with a network that has been detected. This may reduce the time and resources spent searching when no network is available while also reducing the probability that a potentially successful radio interface is terminated.
  • FIG. 1 shows a diagram of an example wireless communication system 100 including UEs that may communicate with networks utilizing different RATs.
  • the wireless communication system 100 includes a number of first base stations (or cells) 105 utilizing a first RAT, a second base station 115 utilizing a second RAT, UEs 125, a first core network 140 for the first RAT, and a second core network 150 for the second RAT.
  • the base stations 105 and/or 115 may communicate with the UEs 125 under the control of a base station controller (not shown), which may be part of the first core network 140 or the second core network 150.
  • a UE 125 may be in simultaneous communication with the first core network 140 and the second core network 150 through a first base station 105 and a second base station 115, respectively.
  • the UE 125 may lose a connection to the first network, as indicated by an Out of Service (OOS) or Radio Link Failure (RLF) indication. If this occurs, the UE 125 may attempt to search for another candidate network that is available to provide service.
  • the UE 125 may initially only be communicating with the second network 150, and it may detect that the first network 140 is available to provide service. In this circumstance, the UE 125 may attempt to establish a communication link 130 with the first network 140 while maintaining a communication link 130 with the second network 150.
  • OOS Out of Service
  • RLF Radio Link Failure
  • First base stations 105 may communicate control information and/or user data with the first core network 140 through backhaul links 145.
  • Second base station 115 may communicate control information and/or user data with the second core network 150 through backhaul links 155.
  • the first base stations 105 may communicate, either directly or indirectly, with each other over backhaul links 135, which may be wired or wireless communication links.
  • the wireless communication system 100 may support operation on multiple carriers (waveform signals of different frequencies). Multi-carrier transmitters can transmit modulated signals simultaneously on the multiple carriers.
  • each communication link 130 may be a multi-carrier signal modulated according to various radio technologies. Each modulated signal may be sent on a different carrier and may carry control information (e.g. , reference signals, control channels, etc.), overhead information, data, etc.
  • the base stations 105 and 115 may wirelessly communicate with the UE 125 via one or more base station antennas. Each of the first base station 105 sites may provide communication coverage for a respective first geographic coverage area 110.
  • base stations 105 and 115 may be referred to as a base transceiver station, a radio base station, an access point, a radio transceiver, a basic service set (BSS), an extended service set (ESS), a NodeB, eNodeB (eNB), Home NodeB, a Home eNodeB, or some other suitable terminology.
  • the first geographic coverage area 110 for a first base station 105 may be divided into sectors making up only a portion of the coverage area (not shown).
  • Second geographic area 120 for second base station 115 may also be so divided.
  • the wireless communication system 100 may include base stations 105 and/or 115 of different types (e.g., macro, micro, and/or pico base stations). There may be overlapping coverage areas for different RATs.
  • the first core network 140 may communicate with the base stations 105 via a backhaul links 155 (e.g., SI, etc.).
  • the base stations 105 may also communicate with one another, e.g., directly or indirectly via backhaul links 135 (e.g., X2, etc.) and/or via backhaul links 145 (e.g., through first core network 140).
  • the second base station 115 may also communicate with other base stations using the second RAT (not shown).
  • the wireless communication system 100 may support synchronous or asynchronous operation. For synchronous operation, the base stations 105 and/or 115 may have similar frame timing, and transmissions from different base stations 105 and/or 115 may be approximately aligned in time. For asynchronous operation, the base stations 105 and/or 115 may have different frame timing, and transmissions from different base stations 105 and/or 115 may not be aligned in time.
  • the techniques described herein may be used for either synchronous or asynchronous operations.
  • the UEs 125 are dispersed throughout the wireless communication system 100, and each UE 125 may be stationary or mobile.
  • a UE 125 may be ground based or located on an airborne vehicle.
  • a UE 125 may also be referred to as a mobile device, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a UE, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.
  • a UE 125 may be a two-way radio, a radio cellular phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a wireless local loop (WLL) station, or the like.
  • PDA personal digital assistant
  • WLL wireless local loop
  • the communication links 130 shown in wireless communication system 100 may include uplink (UL) and/or downlink (DL) transmissions from a UE 125 to base stations 105 and/or 115.
  • the downlink transmissions may also be called forward link transmissions while the uplink transmissions may also be called reverse link transmissions.
  • the communication links 130 may utilize different RATs.
  • FIG. 2 a block diagram 200 illustrates an exemplary UE 125-a for switching between RATs in accordance with various embodiments.
  • the UE 125-a may be an example of one or more aspects of a UE 125 described with reference to FIG. 1.
  • the UE 125-a may include a receiver 205, a RAT switching module 210, and/or a transmitter 215.
  • the UE 125-a may also include a processor (not shown). Each of these components may be in communication with each other.
  • These components of the UE 125-a may, individually or collectively, be implemented with one or more application- specific integrated circuits (ASICs) adapted to perform some or all of the applicable functions in hardware.
  • ASICs application-specific integrated circuits
  • the functions may be performed by one or more other processing units (or cores), on one or more integrated circuits.
  • other types of integrated circuits may be used (e.g., Structured/Platform ASICs, Field Programmable Gate Arrays (FPGAs), and other Semi- Custom ICs), which may be programmed in any manner known in the art.
  • the functions of each unit may also be implemented, in whole or in part, with instructions embodied in a memory, formatted to be executed by one or more general or application- specific processors.
  • Each of the noted modules may be a means for performing one or more functions related to operation of the UE 125-a.
  • the receiver 205 may receive information such as packets, user data, and/or control information including synchronization and pilot signals.
  • the received information may be demodulated, descrambled, de-interleaved, and decoded.
  • the information may be passed on to the RAT switching module 210, and to other components of the UE 125-a.
  • the receiver 205 may include a single antenna, or it may include a plurality of antennas.
  • the RAT switching module 210 may determine that a condition has been met relating to an availability of a first network. It may then adaptively select a timing period according to a RAT switching scheme based at least in part on the condition. The RAT switching module 210 may then initiate a timer based at least on the timing period. When the timing period has elapsed, the RAT switching module 210 may generate instruction to terminate a search for a candidate network or a radio interface with a first network. Information and instructions may then be passed to a processor (not shown), the receiver 205, the transmitter 215, or other components of the UE 125-a.
  • the transmitter 215 may transmit the one or more signals received from the RAT switching module 210 or other components of the UE 125-a.
  • the transmitter 215 may be collocated with the receiver in a transceiver module (not shown).
  • the transmitter 215 may include a single antenna, or it may include a plurality of antennas.
  • a block diagram 300 illustrates an exemplary UE 125-b displaying a more detailed view of the RAT switching module 210-a.
  • the UE 125-b and its components may be an example of one or more aspects of a UE 125 described with reference to FIG. 1 and/or 2.
  • the UE 125-b may include a receiver 205, a RAT switching module 210-a, and/or a transmitter 215.
  • the UE 125-a may also include a processor. Each of these components may be in communication with each other.
  • These components of the UE 125-b may, individually or collectively, be implemented with one or more application- specific integrated circuits (ASICs) adapted to perform some or all of the applicable functions in hardware.
  • ASICs application-specific integrated circuits
  • the functions may be performed by one or more other processing units (or cores), on one or more integrated circuits.
  • other types of integrated circuits may be used (e.g., Structured/Platform ASICs, Field Programmable Gate Arrays (FPGAs), and other Semi- Custom ICs), which may be programmed in any manner known in the art.
  • the functions of each unit may also be implemented, in whole or in part, with instructions embodied in a memory, formatted to be executed by one or more general or application- specific processors.
  • Each of the noted modules may be a means for performing one or more functions related to operation of the UE 125-b.
  • the receiver 205 and the transmitter 215 may perform the functions previously described with reference to FIG. 2.
  • the RAT switching module 210-a may include a condition check module 305, a RAT switching schematic 310, and a timing module 315.
  • the condition check module 305 may determine that a condition has been met relating to an availability of a first network.
  • the condition may be based at least in part on an OOS for the first network or an RLF of the first network.
  • the condition may be based at least in part on an indication that the first network is available to provide service.
  • the RAT switching schematic 310 may provide instructions to determine how to adaptively select a timing period according to a RAT switching scheme. In one embodiment, the RAT switching schematic 310 uses a plurality of different timing period variables for different categories of circumstances. In another embodiment, the RAT switching schematic 310 may provide instructions to dynamically change the value of a single timing period variable based on one or more categories of circumstances. In one embodiment, the one or more categories are based at least on a source network being a second generation (2G) network, a third generation (3G) network, or a fourth generation (4G) network, or on a target network being a 2G network, a 3G network, or a 4G network.
  • 2G second generation
  • 3G third generation
  • 4G fourth generation
  • a first category is based at least in part on a source network being a 2G network and a detected target network being a 3G network or a 4G network.
  • a second category may be based at least in part on a source network being a 3G network and the detected target network being a 2G network or a 4G network.
  • a third category may be based at least in part on the source network being a 4G network and the detected target network being a 2G network or a 3G network.
  • the first category may be based at least in part on a source network being a 2G network and a detected target network being a 3G network or a 4G network
  • the second category may be based at least in part on the source network being a 3G network or a 4G network and the detected target network being a 2G network, a 3G network or a 4G network.
  • the timing module 315 may initiate a timer based on the timing period adaptively selected according to the instruction provided by the RAT switching schematic 310 and the condition check module 305. It may then determine whether the timing period has elapsed. In some cases, it may determine that the timing period has elapsed prior to finding a candidate network. In other cases, a candidate network may be found prior to the elapse of the timing period. In yet other cases, the timing module 315 may determine that the timing period has elapsed prior to successfully establishing a radio interface with a first network. In some cases, the radio interface with the first network may be successfully established prior to the elapse of the timing period.
  • a block diagram 400 illustrates an exemplary RAT switching module 210-b.
  • the RAT switching module 210-b and its components may be an example of one or more aspects of a RAT switching module 210 described with reference to FIG. 2 and/or 3.
  • the RAT switching module 210-b may include a network search module 405, a first interface module 410, and a second interface module 415.
  • the components of the RAT switching module 210-b may be in communication with each other over one or more busses.
  • These components of the RAT switching module 210-b may, individually or collectively, be implemented with one or more application- specific integrated circuits (ASICs) adapted to perform some or all of the applicable functions in hardware.
  • ASICs application-specific integrated circuits
  • the functions may be performed by one or more other processing units (or cores), on one or more integrated circuits.
  • other types of integrated circuits may be used (e.g., Structured/Platform ASICs, Field Programmable Gate Arrays (FPGAs), and other Semi- Custom ICs), which may be programmed in any manner known in the art.
  • the functions of each unit may also be implemented, in whole or in part, with instructions embodied in a memory, formatted to be executed by one or more general or application- specific processors.
  • Each of the noted modules may be a means for performing one or more functions related to operation of the RAT switching module 210-b.
  • condition check module 305 may perform the functions previously described with reference to FIG. 3.
  • the network search module 405 may initiate a search for a candidate network that is available to provide service to the UE 125. In one embodiment, a search is initiated subsequent to the UE receiving an OOS or RLF indication. In this case the network search module 405 may terminate a search for a candidate network if the timing module 315 indicates that the adaptively selected timing period has elapsed prior to detecting a candidate network. In another embodiment, the network search module 405 may detect a first network that is available to provide service and provide an indication to the RAT switching module 210 in order to select a timing period for attempting to establish an interface with the first network.
  • the first interface module 410 may initiate an interface with a candidate network prior to determining that a timing period has elapsed. This may occur after the network search module 405 has successfully completed a search during a timing period associated with the search.
  • the first interface module 410 may initiate a radio interface with a first network that is available to provide service. In some cases the radio interface may be successfully established prior to determining that a timing period has elapsed. The timing period in this case may be associated with the establishment of the interface. In other cases, the timing period may elapse prior to successfully establishing an interface with the first network. When this occurs, the first interface module 410 may terminate the radio interface with the first network. In some cases the first interface module 410 may terminate an attempt to establish the radio interface with the first network.
  • the second interface module 415 may establish an interface with a second network.
  • the first network and the second network may use a first RAT and the second network may use a second RAT that is different from the first.
  • the first network may utilize a 3G or 4G RAT and the second network may utilize a 2G RAT.
  • first interface module 410 may establish a packet switched radio link with the first network and the second interface module 415 may establish a circuit switched radio link with the second network.
  • a circuit switched radio link and a packet switched radio link may be established with the second network.
  • a block diagram 500 illustrates an exemplary UE 125- cconfigured to switch between networks utilizing different RATs.
  • the UE 125-c and its components may be an example of one or more aspects of a UE 125 described with reference to FIG. 1, 2, and/or 3.
  • the components of UE 125-c may also have similar functionality to the components of discussed above.
  • the RAT switching module may be an example of the RAT switching module 210 with reference to FIG. 2, 3, and/or 4.
  • the UE 125-c may also include a processor module 505, a memory 510, software 515, a first modem 520, a second modem 525, and a network communications module 530, which each may be in communication, directly or indirectly, with each other (e.g., over one or more buses).
  • the transmitter 215 may be configured to communicate bi- directionally with one or more networks.
  • the UE 125-c may communicate with a first core network 140and/or the second core network 150 through the network communications module 530 via the first base station 105 and the second base station 115.
  • the receiver 205, the RAT switching module 210, and the transmitter 215 may perform the functions previously described with reference to FIG. 2, 3, and/or 4.
  • the UE 125-c may also include a non-transitory computer-readable medium storing instructions executable by a processor that may be included in the processor module 505.
  • the memory 510 in particular may also be in electronic communication with the processor module 505.
  • the memory 510 may include random access memory (RAM) and read-only memory (ROM).
  • the memory 510 may also store computer-readable, computer-executable software code 515 containing instructions that are configured to, when executed, cause the processor module 505 to perform various functions described herein (e.g., call processing, database management, message routing, etc.).
  • the software code 515 may not be directly executable by the processor module 505 but may be configured to cause the computer, e.g. , when compiled and executed, to perform functions described herein.
  • the processor module 505 may include an intelligent hardware device, e.g. , a central processing unit (CPU), a microcontroller, an application- specific integrated circuit (ASIC), etc.
  • the UE 125-c may communicate with the first network using the first modem 520.
  • communication with the first network may comprise sending data over a packet switched radio link.
  • the first modem 520 may be used to communicate with the first network by sending packets configured according to the Internet Protocol (IP).
  • IP Internet Protocol
  • the first modem 520 may communicate using an interface established by the first interface module 410.
  • the first modem 520 is configured to communicate with a 3G or a 4G network.
  • the UE 125-c may communicate with the second network using the second modem 525.
  • communication with the second network may comprise sending data over a circuit switched radio link.
  • the second modem 525 may send analog voice data.
  • the second modem 525 may communicate with a second network over an interface established by the second interface module 415.
  • UE 125-c may be configured so that the first interface module 410 and the second interface module 415 may be used interchangeably with the first modem 520 and the second modem 525.
  • the first modem 520 and the second modem 525 may both be in communication with the same network.
  • the first modem 520 may be configured to send packet switched data over the second network while the second modem 525 may be configured to send circuit switched data over the second network.
  • the second interface module 415 may be means for establishing a radio interface with a second network
  • the second modem 525 may be means for communicating with the second network.
  • FIG. 6 a diagram 600 illustrates one embodiment of a UE 125 communicating with networks utilizing different RATs.
  • UE 125 may be an example of UE 125 with reference to FIG. 1, 2, 3, and/or 5.
  • a circuit switched radio link 605 may be used by UE 125 to send data to a 2G network 615.
  • circuit switched radio link 605 may be established, maintained, and/or terminated by the second interface module 415. Communications over circuit switched radio link 605 may be conducted utilizing second modem 525.
  • a packet switched radio link 610 may be used by UE 125 to send data to the 3G/4G network 620.
  • packet switched radio link 610 may be established, maintained, and/or terminated by the first interface module 410. Communications over circuit switched radio link 605 may be conducted utilizing first modem 520.
  • FIG. 7A, 7B, 7C, and 7D illustrate various examples of a UE switching between networks utilizing different RATs.
  • the components of Figs 7A, 7B, 7C, and 7D may be examples of the components with reference to FIG. 6.
  • Diagram 700 illustrates packet switched radio link 610 being switched from 3G/4G network 620 to 2G network 615. In one embodiment, this is in response to an OOS or RLF indication relating to 3G/4G network 620.
  • network search module 405 attempts to detect another 3G or 4G network that is available to provide service prior to switching to 2G network 615.
  • Diagram 720 illustrates packet switched radio link 610 being switched from 2G network 615 to 3G/4G network 620.
  • this is switch may be in response to network search module 405 indicating that it has detected a 3G/4G network 620 that is available to provide service.
  • the first interface module 410 may then attempt to establish an interface with 3G/4G network 620.
  • Diagram 740 illustrates packet switched radio link 610 being switched from 4G network 750 to 3G network 745. In one embodiment, this is in response to an OOS or RLF indication relating to 4G network 750. In some cases, network search module 405 attempts to detect another 4G network that is available to provide service prior to switching to 3G network 745.
  • Diagram 760 illustrates packet switched radio link 610 being switched from 4G network 745 to 4G network 750.
  • this is switch may be in response to network search module 405 indicating that it has detected a 4G network 750 that is available to provide service.
  • the first interface module 410 may then attempt to establish an interface with 4G network 750.
  • a flowchart 800 shows a method for switching communications between networks that utilize different RATs.
  • the method 800 is described below with reference to one of the UEs 125 described with reference to FIG. 1, 2, 3, 5, 6, 7A, 7B, 7C, and/or 7D.
  • a UE 125 may execute one or more sets of codes to control the functional elements of the UE 125 to perform the functions described below.
  • the condition check module 305 may determine that a condition has been met relating to an availability of a first network.
  • the condition may be based on an OOS or RLF indication, which may be generated by the first interface module 410.
  • the condition may be based on the network search module 405 detecting a network that is available to provide service.
  • the condition check module 305 may be means for determining that a condition has been met relating to an availability of a first network.
  • a flowchart 900 shows a method for switching communications between networks that utilize different RATs subsequent to an OOS or RLF indication.
  • the method 900 is described below with reference to one of the UEs 125 described with reference to FIG. 1, 2, 3, 5, 6, 7A, 7B, 7C, and/or 7D.
  • a UE 125 may execute one or more sets of codes to control the functional elements of the UE 125 to perform the functions described below.
  • condition check module 305 may determine that a condition relating to, or based at least in part on, an OOS indication or RLF for a first network. In one embodiment, this indication may be generated by the first interface module 410.
  • the RAT switching schematic 310 may adaptively select a timing period according to a RAT switching scheme.
  • the RAT switching schematic 310 may associate OOS or RLF indication with timing periods for a switch from a higher generation network to a lower generation network. For example, it may be from 3G network or 4G network to a 2G network or a 3G network.
  • the timing module may initiate a timer.
  • the timing period may be shorter than a timing period for establishing a radio interface.
  • the timing period may be within the range of 0-30 seconds. In another embodiment it may be within the range of 2-3 seconds.
  • the network search module 405 may initiate a search for a candidate network.
  • the network search module 405 may search for a network of the same or higher generation RAT.
  • the network search module 405 may search for a network of a lower generation RAT.
  • the network search module 405 may be means for initiating a search and searching for a candidate network that is available to provide service.
  • the first interface module 410 may initiate an interface with the candidate network.
  • the first interface module 410 may be means for initiating an interface with the candidate network prior to determining that the timing period has elapsed.
  • the network search module 405 may terminate the search for a candidate network. In one embodiment, if a search for a 3G or 4G network is terminated, the UE 125 may continue to communicate using a 2G network using one or both of the first modem 520 and the second modem 525. Thus, the network search module 405 may be means for terminating the search for the candidate network.
  • condition check module 305 may determine that a condition has been met relating to a first network that is available to provide service. Once the first network is detected that may be available to provide service, the first interface module 410 may attempt to establish a radio interface.
  • the RAT switching schematic 310 may adaptively select a timing period according to a RAT switching scheme.
  • the RAT switching schematic 310 may associate detection of a network with timing periods for a switch from a lower generation network to a higher generation network. For example, it may be from 2G network or 3G network to a 3G network or a 4G network.
  • the timing module may initiate a timer.
  • the timing period may be longer than a timing period associated with searching for a candidate network.
  • the timing period may be within the range of 5-35 seconds. In another embodiment it may be within the range of 5-10 seconds.
  • the first interface module 410 may initiate a radio interface with the first network.
  • the second interface module 415 may establish an interface with the first network.
  • the first interface module attempts to establish an interface with a network that utilizes a higher generation RAT than a network that the UE is already using for communications.
  • the interface may be for the purpose of transmitting and/or receiving data in the form of IP packets.
  • the first interface module 410 may be means for initiating a radio interface with the first network.
  • the RAT switching module 210 may determine whether an interface has been established prior to the elapse of the timing period. In one embodiment, it may make this determination by combining input from the timing module 315 and first interface module 410. Thus, the RAT switching module 210 may be means for determining that the timing period has elapsed prior to successfully establishing a radio interface with the first network.
  • the first interface module 410 may successfully establish the radio interface with the first network prior to the elapse of the timing period. In some embodiments, this allows the UE 125 to switch communications to a network utilizing a higher generation RAT. Thus, the first interface module 410 may be means for successfully establishing the radio interface with the first network prior to determining that the timing period has elapsed.
  • the functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope and spirit of the disclosure and appended claims. For example, due to the nature of software, functions described above can be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
  • Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a storage medium may be any available medium that can be accessed by a general purpose or special purpose computer.
  • computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general-purpose or special- purpose computer, or a general-purpose or special-purpose processor.
  • any connection is properly termed a computer-readable medium.
  • Disk and disc include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.
  • a CDMA system may implement a radio technology such as CDMA2000, Universal Terrestrial Radio Access (UTRA), etc.
  • CDMA2000 covers IS-2000, IS-95, and IS-856 standards.
  • IS-2000 Releases 0 and A are commonly referred to as CDMA2000 IX, IX, etc.
  • IS-856 (TIA-856) is commonly referred to as CDMA2000 lxEV-DO, High Rate Packet Data (HRPD), etc.
  • UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA.
  • a TDMA system may implement a radio technology such as Global System for Mobile Communications (GSM).
  • GSM Global System for Mobile Communications
  • An OFDMA system may implement a radio technology such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, etc.
  • UMB Ultra Mobile Broadband
  • E-UTRA Evolved UTRA
  • Wi-Fi Wi-Fi
  • WiMAX IEEE 802.16
  • IEEE 802.20 Flash-OFDM
  • UTRA and E-UTRA are part of Universal Mobile Telecommunication System (UMTS).
  • 3GPP Long Term Evolution (LTE) and LTE- Advanced (LTE- A) are new releases of UMTS that use E-UTRA.
  • UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP).
  • CDMA2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2).
  • 3GPP2 3rd Generation Partnership Project 2
  • the techniques described herein may be used for the systems and radio technologies mentioned above as well as other systems and radio technologies.
  • the description above describes an LTE system for purposes of example, and LTE terminology is used in much of the description above, although the techniques are applicable beyond LTE applications.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne des procédés, des systèmes et des dispositifs pour commuter des communications entre des réseaux qui utilisent des technologies d'accès radio (RAT) différentes. Un équipement utilisateur (UE) peut déterminer qu'une condition est satisfaite concernant la disponibilité d'un premier réseau. La condition peut concerner la réception d'une indication hors service (OOS) ou de défaillance de liaison radio (RLF), ou peut concerner une indication qu'un nouveau réseau a été détecté qui peut être disponible pour fournir un service. L'UE peut ensuite sélectionner d'une manière adaptative une période de temporisation conformément à une technique de commutation de RAT au moins en partie sur la base de la condition. L'UE peut ensuite lancer un temporisateur basé sur la période de temporisation. Le temporisateur peut être utilisé pour déterminer quand mettre fin à une tentative de recherche ou une tentative d'établissement d'une interface avec le nouveau réseau.
PCT/CN2013/087686 2013-11-22 2013-11-22 Temporisateur adaptatif pour délai de commutation inter-technologie d'accès radio optimisé dans un dispositif double radio WO2015074245A1 (fr)

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PCT/CN2013/087686 WO2015074245A1 (fr) 2013-11-22 2013-11-22 Temporisateur adaptatif pour délai de commutation inter-technologie d'accès radio optimisé dans un dispositif double radio

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2491046A (en) * 2012-05-24 2012-11-21 Renesas Mobile Corp Avoiding interruption to circuit-switched voice calls by unrecoverable errors in packet-switched radio bearers
CN102857998A (zh) * 2012-08-24 2013-01-02 电子科技大学 多模多待手持移动终端设备入网搜索时间间隔的自适应设置方法和装置
CN102893672A (zh) * 2010-06-24 2013-01-23 苹果公司 移动无线设备中的扩展小区搜索和选择

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102893672A (zh) * 2010-06-24 2013-01-23 苹果公司 移动无线设备中的扩展小区搜索和选择
GB2491046A (en) * 2012-05-24 2012-11-21 Renesas Mobile Corp Avoiding interruption to circuit-switched voice calls by unrecoverable errors in packet-switched radio bearers
CN102857998A (zh) * 2012-08-24 2013-01-02 电子科技大学 多模多待手持移动终端设备入网搜索时间间隔的自适应设置方法和装置

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